save project

snake.py

@@ -55,11 +55,13 @@ while True:
         y += 30
     position.append((x, y))
     if x == apple_x and y == apple_y:
-        score+=100000000000000000000000000000000000000000000000
+        score+=10
         apple_x = random.randint(0,21)*30
         apple_y = random.randint(0,15)*30
     else:
         position.pop(0)
+    if x>630 or x<0 or y>450 or y<0:
+        exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去